/* -*- c++ -*- */
/*
 * Copyright 2013,2018 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */


#ifndef FASTNOISE_SOURCE_H
#define FASTNOISE_SOURCE_H

#include <gnuradio/analog/api.h>
#include <gnuradio/analog/noise_type.h>
#include <gnuradio/sync_block.h>
#include <vector>
#include <cstdint>

namespace gr {
  namespace analog {

    /*!
     * \brief Random number source
     * \ingroup source_blk
     *
     * \details
     * Generate random values from different distributions.
     * Currently, only Gaussian and uniform are enabled.
     */
template<class T>
    class ANALOG_API fastnoise_source : virtual public sync_block
    {
    public:
      // gr::analog::fastnoise_source::sptr
      typedef boost::shared_ptr< fastnoise_source<T> > sptr;

      /*! \brief Make a fast noise source
       * \param type the random distribution to use (see
       *        gnuradio/analog/noise_type.h)
       * \param ampl the standard deviation of a 1-d noise process. If
       *        this is the complex source, this parameter is split
       *        among the real and imaginary parts:
       *        <pre>(ampl/sqrt(2))x + j(ampl/sqrt(2))y</pre>
       * \param seed seed for random generators. Note that for uniform
       *        and Gaussian distributions, this should be a negative
       *        number.
       * \param samples Number of samples to pre-generate
       */
      static sptr make(noise_type_t type, float ampl,
		       long seed = 0, long samples=1024*16);
      virtual T sample() = 0;
      virtual T sample_unbiased() = 0;
      virtual const std::vector<T>& samples() const = 0;

      /*!
       * Set the noise type. Nominally from the
       * gr::analog::noise_type_t selections, but only GR_GAUSSIAN and
       * GR_UNIFORM are currently available.
       */
      virtual void set_type(noise_type_t type) = 0;

      /*!
       * Set the standard deviation (amplitude) of the 1-d noise
       * process.
       */
      virtual void set_amplitude(float ampl) = 0;

      virtual noise_type_t type() const = 0;
      virtual float amplitude() const = 0;
    };

    typedef fastnoise_source<float> fastnoise_source_f;
    typedef fastnoise_source<std::int32_t> fastnoise_source_i;
    typedef fastnoise_source<std::int16_t> fastnoise_source_s;
    typedef fastnoise_source<gr_complex> fastnoise_source_c;
  } /* namespace analog */
} /* namespace gr */


#endif /* FASTNOISE_SOURCE_H */
